Valve for air tubes



Sept. 2 1924.

G. W. SHEELEY VALVE FOR AIR TUBES,

Filed Aug. e, 1922 www .- Patented Sept. 2,

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Toallwkomz'tmyconcem: Be it known that I, Grenen W. Simiiwr, whose residence is Frederick, land, and a citizen ofthe United States, have invented certain new and useful vImprovements in V-alves for Air Tubes, ofwhich the following is a speciiication, reference being had to the accompanying drawings, forming a part thereof.

My invention relates to valve for air tubes, land is particularly intended for use in connection with the air tubes of pneumatic tires for automobiles andthe like, and has for its object to provide a device of this 'class which will be simple and inexpensive .'to construct, which will permit free entrance of air under pressure to'iniiate the tireand will close instantly and postively when the ingoing pressure is .relieved or is reduced s o that the outward or back pressure exceeds it. A further object of the invention is to provide a. device of this class in which all operations necessary to the interior confrom the outer end. A further object o f the invention'is to provide a device of this class in which the use of springs is dispensed with and in which the valve gasket. is protected against dipl'acement by the air pressure.

With the objects above indicated, and other ob]ects.hereinafter described in view my invention consists in the construction and combination of elements hereinafter described and claimed.

Referring to the drawings:

Figure 1 is a longitudinal central sectional view on line 1-1 ofFigure 'o; a complete air valvel embodying my invention.

Figure 2 is a side view partly in section of the tube of the air valve.

' e 3 is an end view of the tube shown in Fig. 2.

Fi re-l is a detail view of the valve on an e arged scale. i

Figure 5 is a bottom end view of the valve shown in Fi 4.

Figure 6 is a longitudinal central. s'ectiona view of the end plug carrying the valve seat` Figure 7 is an end view of the end plug.

Figure 8 is a side view of the gasket.

Figure 9 is a vertical central sectional view ofthe gasket. 1 -A the drawings 1 indicates the air inlet vportion4 6 is permanently secured A tube of the inner tube of a pneumaticl tire i having its bore enlarged at its outer end and screw threaded as shown at 2, to re-` ceive the screw threaded portion 3 of a hollow plug 4. This hollow plug 4, has a shoulder 5 at the end oi the screw threaded portion 3 and when in place in the tube 1 this shoulder 5 iits against and makes a tight joint with the outer end of trhe tube.

The tube 1 is provided with a reduced portion 6 at its inner end which is screw threaded to receive a cori-u ted disk 7 which, in use bears againstt e interior of the `inner tube of the tire.' 'The eorru ated disk after being `screwed onto the uced l in place y peening or spinning theend of the tube into an annular recess 8 in the disk The bore 9 of the tube is'of relatively small diameter from its inner end to a oint 10 towards its outer end. 'At this point a conical enlargement 11 is formed and continuous with this a spherical enlargement 12 is yformed and from thegoutenend of this enlargement extends a cylindrical bore 13 of greater diameter thanfthe bore 9 but of` less diameter than the greater diameter of, the spherical enlargement 12. f

The hollow plug 4 has at the inner end of. its screw threaded portion 3 a cylindrical rtion v14; which fits within the cylindrical re 13 and is provided at its end with a valve seat 15 formed by a Vshaped annular oove in its end. The outer end of the holdw plug is extremely screw threaded at 16 to receive the usual dust cap 17.

From the inner end of the plu to a uit 18 extends a bore 19 of relative y sm diameter. From the oint 18 to the outer end the bore is of l atively larger diameter as shown'at 20. v

Within the 'outer end of the end of the tube 1 is arranged a valve 21 carried by a l valve stem 22 which extends outward throu h Athe bores 19 and 20 of the end plug 4 Tie main portion of this valve con-y sists of a disk of such diameter as to lit iosl an annular recess 25, between, the outer face of the disk and the innert-eido the cylindrical reduced portion 23 theinner diameter of this annular recessbeing of less diameter than the diameter of'the portion 23 so that a retaining shoulder y26 isfformed at the base of this portion 23.

In the annular recess isl received and retained a asket or washer 27 consisting of a disk of re atively soft elastic material having a central opening 28 of such diameter as to readily lit over the valve stem 22 the material of the washer being suiiiciently elastic to permit the washer to be forced over the taper 24 and into the recess 25 without breaking.

In the inner face of the disk 21 are `formed a series of radial grooves 28 tapering in depth from the center of. the disk to its per riphery.

When the valve stem is pushed inward to permit the air to escape from the inner tube the c lindrical portion 23 of the valve is force out of the cylindrical portion 19 of the end plu andthe gasket 27 is :forced away from t e valve seat 15, the main disk portion of the valve is forced inward into vthe spherical enlargment 12 so that an annular s ace is left tween the periphery of the di and the wall of this enlargement. Inward movement of the disk is checked by contact of the 1periphery of its inner face with the conica` portion 11 but the` grooves 28 permit air to ner face of the tion.

When the valve stem is released the pressure of the airv from the interior of' the inner tube moves the valve outward and as soon as the valve disk reaches the inner end pass freely between the inisk and this .conical poro the cylindrical bore 13, iiow of air past the disk is ractically prevented and the full pressure o the air acts upon the valve disk to force 1t outward to carry the cylindrical portion23 of the valve into the cylindrical portion 19 of the end plug and forces the gasket 27 ainst the valve seat 15.

The ann ar recess 25, in the outer face of lthe disk portion of the valve is so formed that a relatively thin annular wall 29 is left between the recess and the peri hery of the disk so that the outer adgeb the gasket 27 is protected against the action of the air and cannot be forced outward by air rushin past the valve disk. The gasket is thus he d at il times in properpposition to cooperate with the valve seat.

When air is forced inward to lill the inner tube of the tire the inward pressure of the air moves the valve inward, moving the cylindrical portion 23 out of the cylindrical bore 13 and moving the disk portion of the valve into the spherical enlargement 12 so that airmay pass freely between the walls from its outer end, an enlargement at the' inner end of the 'cylindrical bore of larger diameter, a hollowplug extending into the lcylindrical. bore of larger diameter from its outer end, terminating a substantial distance from the outer end of the enlargement and having a vvalve seat at its inner end, and a cylindrical valve adapted to fit the cylindrical bore of larger diameter and of a length not less than the distance between the inner end of the hollow plug and the outer end of the enlargement and provided on its outer face with a gasket adapted to fit against the valve seatA on the inner end of the hollow plug.

2. In a valve -for air tubes, a main tube having av bore relatively small diameter extending from its inner ,end, a cylindricalI i bore of larger diameter extending inward from its outer end, an enlargement at the inner end of the cylindrical bore 'of larger diameter, a-hollow plug extending into the cylindrical bore of larger diameter from its outer end, terminating a' substantial distance from the outer end of the spherical enlargement and havin a valve seat at its inner end, and a cylin rical valve adapted to fit the cylindrical lbore of larger diameter and of a length not less than the distance between the inner end of thehollow plug and the outer end of the enlargement and pro vided on its outer face with a gasket adapted to fit against the valve seat on the inner end of the hollow plug, and also provided on its outer face with a cylindrical reduced ortion adapted to fit the bore of the ho ow plug and of a length not less than the dis'- tance between the inner end of the hollow plug and the outer end of the enlargement.

3. In a valve for air tubes, a mam tube having a bore of relatively small diameter extending from its inner end, a cylindrical bore of larger diameter extending Iinward from its outer end, an enlargement at the inner end of the cylindrical bore of larger diameter, ahollow plug extending into the cylindrical bore of larger diameter from its outer end, terminating asubstantial distance from the inter end of the enlargement and having avalve seat at its inner end, and a cylindrical valve diskadapted to lit the cyllndrical bore of larger diameter and of a length not less than the distance between the inner end of the hollow plug andthe outer end of the enlargement and provided on its outer face with a. gasket adapted to t against the valve seat on the inner end of the hollow plug, and also provided on its outer face with a. cylindrical reduced 0rtion ada ted to fit the bore of the ho ow plug an of a. length not less than the distance between the inner end of the hollow sai above 10 In testimony whereof I hereunto aix my signature.

GEORGE W. SHEELEY. 

